Method of reducing the shank portions of soles



NOV. 28, 1933. 5 |TH 1 ,936,919-

METHOD OF REDUCING THE SHANK PORTIONS OF SOLES Filed Jan. 9, 1933 /3IWIIIWNWIIIIHllllllllmuum Patented Nov. 28, 1933 Application January 9,1933. Serial Ne. 650,803 2 Claims. (c1. 12 '1 ig; v

This'invention relates to a method of reducingthe shank portions of thesoles of boots and knife held at the desired inclination to the treadshoes.

In the manufacture of shoes the outsoles are commonly reduced by makingtwo cuts along the opposite edges of their shank portions so as toprovide thin edges at this locality. In the manufacture of certain typesof shoes, for example that type in which the outsole is attached perrnav sole; and

'nently to the bottornof the lasted shoe by cement, it is desirable thatthe opposite edges of largest sizash'ow'ing the transverse sectlon onall soles of shoes of a given style be "reduced to the samepredetermined thickness irrespective of differences in the'sizes of thesole and that this reduction be accomplished by a production of twobevels whichare' straight in transverse cross-' section. By reducing allthe edgesto the same thickness, all the shoes of a given style will havethe same general appearance in their shank por- By providing all thesoles with bevels which are flat transversely of the soles, all pointstions.

of such surfaces may be pressed firmly against the similar surfaces onthe marginal portions of the lasted shoes, which is important in theattainment of secure attachment of a sole by cement. Hitherto, soleswith reduced shank portions approximating the requirements indicatedabove have been producedfln two operations, by

feedingfirst oneside and then the other side of 3 the shank portions ofsoles past a stationary faces of the soles. It is diflicult by such aprocedure to secure uniform results, and moreover the procedure is arelatively slow one due to the necessity for two separate operations oneach sole.

In order to speed up the shank reducing operation, to simplify it, andto make it uniformly accurate, the present invention relates to a methodof reducing the opposite edges of the shank portions of soles ofdifferent sizes to the same predetermined thickness by straight bevelsof the same angular inclination to the tread surfaces of the soles whichconsists in feeding the soles successively pasta knife while progres-;

sively holding successive marginal localities in their shank portionsbent in converging planes which extend from the longitudinal middle ofsaid shank portions to said opposite edges, and

varying the distance of the knife from the middle" e '5; .1- METHoDOFBEDUCING ,THE SHANK PORTIONS 0F SQLES j John Smith, ,Swampscott',Mass, assignor to United Shoe Machinery Corporation, Paterson, N. J., acorporation of New Jersey 'partly in elevation showing a sole of thelargest I In the manufacture, of shoes t which the soles are permanentlyattached to the .70

. g t apply oats ofipyroxylin cement ret duced' between thetwo coatedsurfaces, -it' i is necessary that they be pressed} firmly into con--use of which the method may' 'be'conveniently v practiced, I 1 J1 Fig. 1is a view partly in"cr oss-section'- and size in process of beingoperatedupon; .1 Fig. "2 is a cross-sectionof the finishedsole? Fig. 3is a view like Fig. 1 but showinga smaller sole'in process of beingoperated uponf Fig. 4 is a cross-section of the finished smaller I V, 5is aplan View-ofa finishedfsole-ofthe which Fig.1 is taken. 3 1

of thattype in lasted uppers by means of cement, it is' cusspectively tothe margins of the" soles and' to the 'marg-ins'of the bottoms of thelasted shoes,

to permit these coatings to dry, to softenyone '75 or both of them, andfinally to placef-the soles 0n the bottoms of the shoes and holdthefsoles T and shoes under pressureuntil the cementl-hardens.- In'orderthata strong-'bond 'may--be protact throughout their cemented'areas. Thesoles"- are reduced by being beveled'on both sides along their-shankportions, as indicated at 7"'and:9,

so asto'lproduce thin edges.) In orderthatfthese "8 5 bevels'maybepressed firmly againstj th'e bottom.

of a shoe there should bend hollows in' their-3.". surfaces, andconsequently the bevels should be: straight and flat, that is theirsurfacesshould appear as straight lines in transversesection. I

In orderto facilitate the reducing'of the'op'po site edges, the solesare fed past a; knife "11 while successive parts of their shankportions. 3

are being progressively held bent as-shown in; Figs. 1 and 3, and thedistance between the:- knife and the middle portion of thetreadlsurfaces of the soles is varied to provide for soles of differentsizes. In the constructionillustrated the soles are fed through a matrixformed in" a matrix sleeve 13 by the rotation of said sleeve and by therotation of a feed roll 15 provided with spaced disks '16 the teeth ofwhich may penetrate more or less into the new side of the sole. Inorderto permit the distance of the middle portions of the soles fromthefplane of the knife to be varied, the matrix sleeve 13,

Stewart No. 1,382,689. In order that the bevels on the opposite sides ofthe soles shall have, the desired flat surfaces, the walls 17, 19' ofthe matrix slope straight atthe same angles from the bottom 21 of thematrix to the surface of the matrix sleeve, said matrix being made largeenough to accommodate soles of the largest size.- Inasmuch as largesoles are longer than smaller ones and consequently the reduced'areasshould vary in length in accordance with the length:

of thejsoles, the matrix sleeve is rotated at different velocitiesaccording to the lengths of the.

soles. The feed roll is rotated at constant velocity. For the longestsoles the matrix sleeve is rotated at the same peripheral velocity asthe feed roll; and for the shorter soles the matrix sleeve is rotated atsuitably increased velocities, for example in the manner shown in thepatent referred to above, so that the matrix will slip to an extent onthe sole in accordance with its increased velocity and the skivingoperation will be finished more quickly and vwill result in shorterreduced portions.

In :Figure 1 a sole of the largest-size is shown in process of beingoperated upon, the shank portion being engagedby the feed roll and bent:into :two converging planes theinclinations of which are determined bythe inclinations of the ;walls 17, and 19; The tread surface of the soleis being pressed against the walls of the matrix,

and the --skivings are being removed from the flesh side of the sole."When, however, the operation has been completed and the sole, which'has been thus progressively distorted is allowed to resume itsundistorted condition, a transverse section of itwill appear as inFigure 2 :in 'whichthe grain or tread surface is indicated t at 23.Returning to Figure 1, it will benoted that the thickness of theopposite edges-of the sole will be, equal to the distance along theedges of thesole from the plane of the knife to the adjacent walls ofthe matrix and that these dis- I j-tances will always be equal to eachother since the walls 17, 19 of the matrix converge at the.sameinclination to the plane of the knife, and the :soles are .fedcentrally through the matrix.

-Re'ferringnow to Figure 3, wherein a smaller sole is shown in processof being operated upon,

-the matrix sleeve has been adjusted toward the,

knife until the distances along the edges of this all sole from theplane of the knife to the shank portions of soles of shoes of varioussizes and of a given style so that their edges will all be of "the samethickness and will all be located at the termination of straight bevelswhich are all of the same inclination to the tread surfaces of thesoles; and when soles of shoes of a diiferent style are to be operatedupon, it will be necessary merely to changethe angles of inclinationintowhich the 'marginal portions of the soles are progressivelybent.

, Having described my invention, what I claim as new and desire tosecure by Letters Patent of the.

United States is:

l. The method of reducing'the opposite edges of the shank portions of aplurality of soles of,

different sizes to the same predetermined thickness by straight bevelsof the same angular inclination to the tread surfaces of thesoles, whichcomprises feeding the soles successively past a knife whileprogressively holding successive marginal localities of their shankportions bent inconverging planes which extend from the longitudinalmiddle of said shank portions to said opposite edges, and varyingthe'distance of the knife from the middle portions of the soles toprovide for soles of different sizes.

2. The method of reducing the opposite edges of the shank portions of aplurality of soles of different sizes toithe same predetermined thickness by straight bevels of the same angular incli-; nation to thetreadsurfaces of the soles, which;

comprises feeding the soles successively pasta knife while progressivelyholding successive marginal localities of their shank portions bent inconverging planes which, extend from the; :i20

longitudinal middle of saidshank portions to said opposite edges, andvaryingthe distance oft-the knife from the middle portions of the solesin accordance with the Widths :of the various soles.

. ,4 JOHN'SMITH.

